Answer:

tref

Answer	Crossword Clue
TREF	Not kosher
TREF	Un-kosher
TREF	Nonkosher

TREF	Unkosher
TREF	Not approved as kosher
TREF	Like pork and shellfish
TREF	Like bacon
TREF	Not kosher.
TREF	Not kosher: Heb.
TREF	Impure, from the Yiddish.
TREF	Not kosher, in Jewish law

TREF	Not allowed on certain diets
TREF	Like shellfish
TREF	Unclean, by Jewish law
TREF	Not conforming to dietary laws
TREF	Like bacon, for some
TREF	Like pork and shellfish, to some
TREF	Unclean, like non-kosher food
TREF	Not suitable for serving at shul

TREF	Unclean food, by Jewish law
TREF	Non-kosher